Trade aluminium windows

Who orders trade aluminium windows?

Mostly builders and main contractors, housing developers, conservatory and extension specialists, architects and specifiers and window and door installers. Typical uses include kitchen and garden-room extensions; contemporary new builds; commercial and mixed-use refurbishments.

Aluminium is stiffer than uPVC, so frames can be slimmer for the same window size, which is why it is often specified for extensions where the client wants as much glass as possible.

Every aluminium window is powder coated to the RAL colour you choose. Dual colour lets you have, for example, anthracite outside and white inside on the same frame.

A polyamide thermal break separates the inner and outer parts of the frame, which is what lets aluminium windows meet modern thermal requirements.

If the windows are part of an extension package with bifold or sliding doors, order them together and the colours and finishes are matched across the job.

How should you measure?

Aluminium frames are rigid and do not flex into an opening, so take accurate measurements and allow a consistent fitting gap all round.

Which building regulations apply?

Replacement windows in England should meet Approved Document L: a U-value of 1.4 W/m²K or a Window Energy Rating of band B. Approved Document F expects background ventilation to be no worse than before, which usually means trickle vents. Glazing in critical locations must break safely, be robust or in small panes, or be permanently protected under Approved Document K, which in practice usually means toughened or laminated safety glass. Rooms that need an escape route may need an escape window under Approved Document B. Replacing windows is notifiable building work: the installer self-certifies through a competent person scheme such as FENSA or Certass, or the work goes through building control.

More detail: Approved Document L guide safety glazing guide. Your installer or designer remains responsible for compliance and any notification.